High-head submersible pump
A multi-stage or high-speed submersible built to lift water a long way vertically rather than to move a lot of it. For deep shafts, tunnel inverts and lifting to an elevated outfall.
Features
- Multi-stage impellers add head rather than flow, so these units are compared on head first and flow second.
- Head requirement includes the vertical lift plus friction in a long rising main, and the friction term is often the larger of the two.
- Clean water duty is normal — high-head stages are intolerant of grit and will wear rapidly if solids are present.
- Discharge pressure can be high enough that hose rating and coupling type matter as much as size.
- Starting against a full rising main is a heavy duty, so a non-return valve and a soft start extend life materially.
Specifications
| Figure | Typical range | Unit | Why it matters |
|---|---|---|---|
| Maximum total head | 40 - 120 | m | The reason for choosing this pump type. |
| Maximum flow | 10 - 60 | m³/h | Secondary to head on this duty. |
| Number of stages | 2 - 8 | Each stage adds head, not flow. | |
| Maximum solids size | 2 - 8 | mm | These are clean-water pumps; grit destroys them. |
| Discharge pressure rating | 6 - 14 | bar | Hose and couplings must match it. |